Basement Waterproofing Cost in Philadelphia (2026)
Average cost in Philadelphia
US$1,462 — US$12,000
US$3 — US$10 per sq ft
Cost Breakdown
ItemizedProfessional installation and excavation
55%
Sealants, membranes, and gravel
20%
Sump pump and drainage pipes
18%
Philadelphia city building permits
4%
Debris removal and site cleanup
3%
Sales Tax at 6%
📋What's Included
ScopeTypically Includes
- Interior drain tile system
- Sump pump installation
- Vapor barrier
- Crack injection sealing
- Labor
Typically Excludes
- Exterior excavation waterproofing
- Foundation repair
- Mold remediation
- Dehumidifier
- Landscaping restoration
Based on interior waterproofing for a standard 800-1,000 sq ft basement.
🧮Estimate Your Cost
InteractiveEstimated Cost
US$6,912 — US$10,368
Based on 8 sources and market data for Philadelphia. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$5,184
Today
US$5,402
Basement Waterproofing in Philadelphia is ↑ 4.2% compared to roughly a year ago — about US$218 more on the average project.
Comparison derived from the year-over-year change rate, not a month-by-month price index. We don't store historical snapshots yet — when we do, this will become a real time series.
🏢Top Waterproofing Contractors in Philadelphia
Verified providersJamison Basement Waterproofing
1429 Ulmer Ave b, Oreland, PA 19075, USA
1,688 reviews
Over the Top Waterproofing
2999 Welsh Rd Office B, Philadelphia, PA 19152, USA
177 reviews
Philadelphia Foundation Repair & Waterproofing
325 Chestnut St Suite 876 #121, Philadelphia, PA 19106, USA
63 reviews
Provider data sourced from public business directories. Ratings and reviews are public and may change. LookupCost is not affiliated with listed providers.
💬What People Actually Paid
Community❓Common Questions
Philadelphia costs are approximately 4% higher than the national average due to the city's higher cost of living and the prevalence of historic row homes with complex limestone foundations that require specialized mortar repair before waterproofing can begin.
Interior waterproofing services in Philadelphia average around $3,125 and focus on managing water that has already entered. In contrast, extensive exterior services, which involve excavation to prevent water entry, average $7,275 but can exceed $15,000 for complex properties.
The average cost for a professional sump pump installation in Philadelphia ranges from $1,112 to $1,560. However, if your basement has thick concrete floors requiring jackhammering, the price can increase by an additional $2,000 to $5,000.
For a standard 20'x30' basement (100 linear feet), an interior French drain system typically costs between $5,000 and $6,000, averaging roughly $50 to $60 per linear foot for labor and materials.
📊Our Methodology
How we collect dataAggregated from 5+ verified web sources and cost databases
Licensed contractor estimates and regional cost guides
Government construction and labor statistics
Community-reported project costs and reviews
Last data collection: 4 days ago. Updates run weekly. All costs in USD.
About this data
Cost figures are estimates synthesized from public market data using AI research and refreshed regularly. Real project costs vary by scope, materials, contractor, and site conditions. Always get verified quotes from licensed contractors for your specific project.
Spotted bad data? Let us know — we'll review and update.